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Bulletin 109 FINAL EDIT FIXED.Indd Ameiva fuscata on Dominica, Lesser Antilles: natural history and interactions with Anolis oculatus SETH M. RUDMAN1, ROBERT POWELL2,4 and JOHN S. PARMERLEE, JR.3 1 Department of Biology, University of Rochester, Rochester, NY 14627, USA. 2 Department of Biology, Avila University, Kansas City, MO 64145, USA. 3 Department of Biology, Johnson County Community College, Overland Park, KS 66210, USA. 4 Corresponding author: [email protected] ABSTRACT — In June 2008, we studied the natural history of Ameiva fuscata and interactions with sympatric Anolis oculatus in five adjacent habitats on the western (leeward) coast of Dominica, Lesser Antilles. Ameiva activity was positively correlated with mean temperature, peak activity corresponded to peak daily temperatures and we observed greatly reduced or no activity during overcast and rainy periods. Population densities in the five habitats were 138–344 lizards/ha, with the higher densities in areas with the deepest leaf litter and densest canopy cover. Ameiva fuscata is an active forager, with 100% of foraging attempts made while moving (either walking or actively digging or rooting in litter). Lizards foraged together in groups and the groups never entered each other’s activity areas, suggesting the possibility of community structure. Ameiva fuscata is non-territorial, but chases among adult males appeared to be triggered by intersecting paths. Anoles spent significantly less time on the ground when Ameiva fuscata was active, presumably to avoid predation. EST Indian islands support abundant and interactions between Ameiva and Anolis. Meier Wdiverse lizard communities. Common & Noble (1991, Desecheo), Fobes et al. (1992, elements of many of these communities include Hispaniola) and Eaton et al. (2002, Anguilla) an active foraging terrestrial lizard in the genus suggested that anoles decrease time spent on the Ameiva and arboreal sit-and-wait ambush foragers ground in the presence of Ameiva. Simmons et in the genus Anolis (Simmons et al., 2005). al. (2005) examined interactions between Ameiva Although West Indian anoline lizards are arguably ameiva and two species of Anolis (A. aeneus and the most intensely studied reptiles in the world A. richardii) on Grenada and concluded that both (Losos, 2009), relatively little is known about species of Anolis spend less time on the ground most species of West Indian Ameiva, especially when A. ameiva is active. Kolbe et al. (2008) considering their visibility on the islands where showed a niche shift by Anolis wattsi to lower they occur (Henderson & Powell, 2009). perches and more terrestrial activity in the absence Ameiva are typically heliothermic, active of Ameiva griswoldi on Antiguan satellite islands. foragers, have relatively short activity periods, are From 4–23 June 2008, we conducted a study not territorial and have overlapping home ranges on Dominica to describe activity, population (e.g., Hillman, 1969; Regal, 1978, 1983; Schell densities, foraging behaviour and movements et al., 1993; Vitt & Colli, 1994; Simmons et al., of Ameiva fuscata and to test the hypothesis that 2005). Ameiva fuscata (Fig. 1; and front cover) is Anolis oculatus (Fig. 2) would spend less time on endemic to Dominica and occurs throughout the the ground when A. fuscata is present and active. island in coastal woodlands, generally at elevations below 200 m, but occasionally higher in cultivated METHODS AND MATERIALS areas (Bullock & Evans, 1990; Malhotra & Our study site was at the mouth of the Batali Thorpe, 1999). River on the leeward (western) coast of Dominica Despite the number of islands on which both (N 15° 27.12', W 061° 26.76'). The site was genera are represented, few studies have addressed characterised by habitats including beach, Herpetological Bulletin [2009] - Number 109 17 Ameiva fuscata, natural history on Dominica Area Size (m2) Insolation Most Abundant Maximum Estimated Vegetation Number Density (#/ha) 1 1134 mixed ground scrub 39 344 2 2035 sunny/mixed Snake Plant 28 138 3 2554 mixed Mango trees 62 243 4 873 shade/mixed scrub, trees 15 172 5 1925 shade/mixed Coconut trees 57 296 Table 1. Characterisation of areas/habitats (see text) and maximum numbers of Ameiva fuscata observed during any one survey. beachside scrub with Sea Grape (Coccoloba manner designed to avoid multiple encounters uvifera) and dry forest interspersed with Mango with the same lizards, we counted the number of trees (Mangifera sp.). Cleared paths passed individual Ameiva fuscata observed in each of the between and extended into most areas. Open five contiguous habitats and calculated estimated areas were characterised by grasses, herbaceous population densities (numbers of animals/ha) using forbs and stands of ornamental vegetation, the maximum number of lizards in any one area including extensive areas planted in “Snake Plant” at one time relative to the areas (m2) sampled. A (Sanseveria sp.). data logger (HOBO® TidbiT® v2 Submersible The five habitat areas (Table 1) were identified Temperature Logger, Onset Computer Corp., after observing what appeared to be natural Bourne, Massachusetts, USA) was placed in leaf groupings of Ameiva associated with areas of high litter at site 5 to record hourly temperatures during population densities and corresponding roughly the extent of the study. to distinct habitat types. Areas/habitats were We conducted focal animal studies on A. characterised by: (1) mix of native and orchard fuscata. Observations ranged from < 1 min to 20 trees with a canopy coverage of 50–80% and a mins in duration. In addition to recording anecdotal sparse 2–3 m high understory, canopy height of observations of individuals or groups of lizards, we 5–15 m with litter depth of 2–4 cm and occasional quantified behaviours using methods of Cooper et human traffic; (2) beachside vegetation with 1–2 al. (2001), recording time spent moving, number m-high understory, canopy coverage of 20–50%, of moves and number of feeding attempts while canopy height 4–12 m, sandy substrate with some stationary or mobile. We used these observations to leaf litter and regular human traffic; (3) orchard calculate moves per minute (MPM), percent time trees with sparse 2–4 m-high understory in some spent moving (PTM) and proportion of feeding areas, canopy coverage ca. 90% over part of the attempts while moving (PAM). area and ca. 10% over the remainder, canopy height Using a paint gun (Forestry Suppliers, Inc., 5–20 m with litter depth of 1–2 cm, abundant fallen Jackson, Mississippi, USA) and two colours of latex fruit and occasional human traffic; (4) mix of native paint diluted 1:1 with water, we marked individual and orchard trees with canopy coverage of 60– A. fuscata active in areas 2 and 5 (along the beach 90% and a dense 1–2 m-high understory, canopy and in a densely shaded area among large boulders), height of 5–20 m with a litter depth of 1–2 cm and attempting to paint all individuals in three sessions occasional human traffic; and (5) orchard trees at each location. The two sites were only ca. 40 m with canopy coverage of 70–90%, leaf litter depth apart and no evident barriers precluded movement 2–4 cm, abundant fallen fruit, sparse understory between the areas. We then observed movements and little human traffic. and behaviours of marked lizards to determine if We conducted 17 45-min surveys at various lizards foraging in one area comprised a grouping times from 0700–1730 h, recording time, extent distinct from those in the other. of cloud cover and any precipitation during each In the same five adjacent habitats, at various times visit. Systematically covering each area in a of day and under varying weather conditions, we 18 Number 109 - Herpetological Bulletin [2009] Ameiva fuscata, natural history on Dominica Figure 1. Adult male Ameiva fuscata. Photograph by Robert Powell. Figure 2. Adult male Anolis oculatus. Photograph by Robert Powell. Herpetological Bulletin [2009] - Number 109 19 Ameiva fuscata, natural history on Dominica conducted 43 10-min surveys of anoles, recording Temperatures were highest just as activity began to lizard position as either on the ground or on elevated decline. The maximum observed population density perches (e.g. vegetation or rocks). Anoles were not in any one area was 344 individuals/ha (Table 1). marked and we may have encountered the same That with the highest density had the deepest leaf individuals more than once. However, we contend litter and the densest canopy cover. Mean MPM for that perches at different times and on different days all A. fuscata was 2.1 ± 0.2 (0.2–4.9). Mean PTM are independent events predicated by either the was 43.8 ± 3.3% (3.0–98.2%). PAM was 100%, presence or absence of Ameiva and that we are not with 55.6% of feeding attempts occurring while guilty of pseudoreplication of data. We recorded animals were searching and 44.3% while in one time, temperature and general weather conditions location but actively digging. during each survey and noted whether A. fuscata Painted individuals were observed daily. The was abundant and active (1), scarce (2), or absent (3). two “subpopulations” were never observed to Figure 3. Mean percent of Ameiva fuscata active in all areas and mean ambient surface temperatures by time of day. We used StatView 5.0 (SAS Institute, co-mingle and never found in areas other than Cary, North Carolina, USA) for statistical where they were initially painted. analyses. Means are presented ± one SE. For all We frequently observed individuals of all sizes tests, alpha = 0.05. foraging together with few interactions between lizards. However, large males regularly chased RESULTS one another. These chases would sometimes occur Ameiva activity (percent of the maximum number between individuals that had been foraging close of Ameiva observed in a given area) was positively together for several minutes.
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